Attack on Pearl Harbor brings the United States into World War II (1941)
Atlantic Charter issued by Roosevelt and Winston Churchill (1941)
Conference among Roosevelt, Churchill, and Stalin in Yalta (1945)
The United States drops atomic bombs on Hiroshima and Nagasaki; World War II ends (1945)
United Nations established (1945)
Central Intelligence Agency (CIA) established (1947)
Pan Am begins round-the-world commercial flights (1947)
North Atlantic Treaty Organization (NATO) established (1949)